. "wherein for general formula (I), R and R1 are individually selected from the group consisting of C1-C4 alkyl, benzyl, and ???C2H4O)xZ where x has a value from 1 to 20 and Z is hydrogen or C1-C3 alkyl; R2 and R3 are each a C8-C30 alkyl or R2 is a C8-C30 alkyl and R3 is selected from the group consisting of C1-C5 alkyl, benzyl, and ???(C2H4O)x???H where x has a value from 2 to 5; and where X??? repr" . . .